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Method for plating high-tin aluminum-based bearing bush with matt tin

A technology of tin-aluminum and base shaft, which is applied in the field of electroplating matte tin for high-tin aluminum-based bearing pads, which can solve the problems such as the difficulty in combining the tin-plated layer with the aluminum base, and achieve the effect of meeting the size and appearance requirements and having a uniform and beautiful surface

Inactive Publication Date: 2018-10-19
CHONGQING HONGJIANG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for electroplating matte tin on high-tin aluminum-based bearing pads, which can solve the problem that the tin-plated layer is difficult to combine with the aluminum base, and realize electroplating matt tin on high-tin aluminum-based bearing pads

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, a method for coating a high-tin aluminum-based bearing bush with matt tin, which includes the following steps:

[0022] 1) Pretreatment: Clean the high-tin aluminum-based bearing pads. After drying, wrap the two bearing pads together into a cylindrical shape, and use PVC tape to insulate the outer round steel back to avoid the reaction between the subsequent zinc dipping solution and the steel back. Soak the insulated bearing bush in chemical degreasing solution for 5 minutes, and then use 600# water sandpaper to clean the uninsulated part of the bearing bush;

[0023] 2) Zinc dipping, wash the high-tin aluminum-based bearing pad pretreated in step 1) with countercurrent water for 30 seconds, and then put it into a zinc dipping solution. The zinc dipping time is 2 minutes, and the zinc dipping temperature is 20°C. The zinc dipping solution is The ratio of commercially available BH-126M quaternary cyanide-free and environmentally friendly zinc dipping solut...

Embodiment 2

[0027] Embodiment 2, a method for coating a high-tin aluminum-based bearing bush with matt tin, which includes the following steps:

[0028] 1) Pretreatment: clean the high-tin aluminum-based bearing pads, and after drying, wrap the two bearing pads together into a cylindrical shape, use PVC tape to insulate the outer round steel back, and then put the insulated bearing pads into a chemical degreasing solution Soak for 5 minutes, then use 600# water sandpaper to clean the uninsulated part of the bearing bush;

[0029] 2) Zinc dipping, wash the high-tin aluminum-based bearing pad pretreated in step 1) with countercurrent water for 60 seconds, and then put it into the zinc dipping solution. The zinc dipping time is 3 minutes, and the zinc dipping temperature is 25°C. The zinc dipping solution is The ratio of commercially available BH-126M quaternary cyanide-free and environmentally friendly zinc dipping solution to pure water is as follows: the content of commercially available ...

Embodiment 3

[0033] Embodiment 3, a method for coating a high-tin aluminum-based bearing bush with matt tin, which includes the following steps:

[0034] 1) Pretreatment: clean the high-tin aluminum-based bearing pads, and after drying, wrap the two bearing pads together into a cylindrical shape, use PVC tape to insulate the outer round steel back, and then put the insulated bearing pads into a chemical degreasing solution Soak for 5 minutes, then use 600# water sandpaper to clean the uninsulated part of the bearing bush;

[0035] 2) Zinc dipping, wash the high-tin aluminum-based bearing pad pretreated in step 1) with countercurrent water for 40 seconds, and then put it into the zinc dipping solution. The zinc dipping time is 2.5 minutes, and the zinc dipping temperature is 22 ° C. The zinc dipping solution The ratio of the commercially available BH-126M quaternary cyanide-free zinc-dipping solution to pure water is: the content of the commercially available BH-126M zinc-dipping solution i...

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PUM

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Abstract

The invention discloses a method for plating a high-tin aluminum-based bearing bush with matt tin. The method comprises the following steps: (1) carrying out pretreatment, specifically, carrying out cleaning and oil removal treatment on the high-tin aluminum-based bearing bush; (2) carrying out zinc dipping, specifically, placing the high-tin aluminum-based bearing bush subjected to the pretreatment in the step (1) in a zinc dipping solution, wherein the zinc dipping time is 2-3min, and the zinc dipping temperature is 20-25 DEG C; (3) carrying out water washing; (4) carrying out tin plating, specifically, placing the high-tin aluminum-based bearing bush subjected to the water washing in a tin plating solution and carrying out tin plating treatment, wherein the tin plating solution comprises the following components with the following concentrations: potassium pyrophosphate with a concentration of 250-300g / L, ammonium citrate with a concentration of 50-100g / L, stannous pyrophosphate with a concentration of 20-50g / L and antioxidant with a concentration of 1-5g / L; and (5) carrying out drying after the water washing to obtain the high-tin aluminum-based bearing bush plated with matt tin. The method is capable of solving the problem that a tin-plated layer and an aluminum base are difficultly combined, and realizing electroplating for the high-tin aluminum-based bearing bush with matt tin.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a method for electroplating matte tin on a high-tin aluminum-based bearing bush. Background technique [0002] At present, most of the internal combustion engine bearings are bimetallic bearings. According to the main metal material of the substrate, there are two types of copper-based and aluminum-based bearings. Aluminum-based bearings can be divided into many types according to the composition of the base material. Generally, the tin content of aluminum alloy materials for bearings reaches 20%, such as AlSn20Cu, AlSn40Cu and other aluminum alloy bearings, which are called high-tin aluminum-based bearings. [0003] The high-tin aluminum-based bearing bush is a composite material because the base material includes not only aluminum alloy but also a steel back, and the steel-based and aluminum-based materials have different electroplating characteristics. It is difficult ...

Claims

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Application Information

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IPC IPC(8): C25D3/32C25D5/44C23C18/31C23C28/02
Inventor 曾庆策张永红张文华辛琦钟宁吴波靳力
Owner CHONGQING HONGJIANG MACHINERY
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